Amazon: Amazon cooling system

[Sharpractice]

Has anyone experience of using Evans cooling fluid in an Amazon please? It works well on other classic cars but I have been warned off it on the Amazon.
Thank you in anticipation

[Rustinmotion]

Originally Posted by Sharpractice

Has anyone experience of using Evans cooling fluid in an Amazon please? It works well on other classic cars but I have been warned off it on the Amazon.
Thank you in anticipation

I think it’s a benefit on cooling systems without expansion tanks, my Alfa always pushed water out of the overflow in stationary traffic and eventually would go very hot, using Evans classic it stopped doing it and behaves perfectly
I cannot think why one engine design over the other would have problems.
it’s not cheap and other than not expanding when hot has no other benefits from good regular coolant

[grumpydad]

Hi
can you tell us why
whats wrong with good old blue antifreeze and water

Thanks

[Derek UK]

When the water pump, rad and thermostat is OK the system works perfectly. My Estate can sit indefinitely in traffic or the garage ticking over without the needle going up more than a degree or so. Why change a good thing. Leave the Evans to non water pump cars like Jay Leno's thermo syphon Oldies.

[blueosprey90]

In my vintage MGA race car, I am not allowed to run antifreeze because if it gets on track, it is extremely slippery and a danger to other racers. I considered using the Evans waterless coolant, but decided against it for reasons that I no longer remember. I opted to use a product called No-Rosion and have been quite satisfied. They have two versions, one for cast iron engines (redish hue) and one for aluminum/alloy based engines (blueish hue). In terms of rust protection, it is very good - at least after several seasons and system drains for the winter. About the only solids that drain out of my engine now appear to be a few fine sand grains left over from the original casting. Water-Wetter is another alternative.

[142 Guy]

First off, I understand the racing requirement for non glycol coolants. You probably dropped the Evans idea because Evans happens to be 100% glycol / propylene glycol / ethylene glycol depending on the particular Evans product. Clearly, the Evans product fails the no glycol rule. Distilled water with Water Wetter or whatever anti corrosion package you want is the way you have to go. Pure water will also provide superior heat transfer from the engine.

The Evans product is designed as 100% glycol base. Evans notes that the product has a very high boiling point (> 375 F) which is why they can probably make the claim that it eliminates boil overs. The very high boiling point has the rather nasty side effect of reducing nucleate boiling in the head (nucleate boiling is desirable) which is critical to getting good heat transfer from the head metal to the cooling fluid. When you purchase conventional non premix engine coolants, if you carefully read the fine print on the back they typically recommend against exceeding a coolant / water concentration of 60%. Higher glycol concentrations elevate the boiling point. This may reduce or eliminate boil over; but, has the perverse effect of elevating the head metal temperature at the same time. The B18 and B20 engines with high compression ratios are already detonation prone and elevating the head metal temperatures is the last place you want to go. You can read here about the effect of Evans Coolant on head temperatures

https://www.norosion.com/evanstest.h...0be%20achieved.

Note the impact on required octane rating. Also note the effect of the elevated head temperature on valve recession on engines that have not had hardened valve seats installed.

Higher water concentration will improve heat transfer away from the engine; which should reduce head metal temperatures; but, the higher water concentration also drops the boiling point so you may increase the risk of boil over if your radiator is impaired by scale or corrosion and you can't get rid of that heat. If you suffer from boil overs Evans Coolant might eliminate the boil over problem; but, have other negative effects. My preference would be to address the cause of the boil over rather than hide it by using Evans Coolant.

Being 100% glycol base, the Evans product should eliminate corrosion issues.
My preference is go with a conventional coolant mixed with distilled water and use the highest water % permissible for the expected temperatures (don't want to crack the radiator by having the coolant freeze) in line with the guidance on the labels. The high water content insures good heat transfer from the head. Flush and replace the coolant every 5 years to make sure the corrosion inhibitors remain active.